Guadalajara, 1867, 4r black on rose, overprinted "Cd. Guzman", ample to mostly large margins, tied by scroll handstamp (Schatzkes 343) on folded letter dated February 28, 1867 to Guadalajara, Very Fine and choice, only two covers recorded, this overprint was used in that small town only from mid-February to mid-March, one of the jewels of the issue; with 1999 MEPSI certificate. Scott No. 7b  Estimate $4,000 - 6,000. $0 (Image)